纤维织物增韧型PDMS复合材料的实验研究

发布时间：2018-03-04 18:28

本文选题：聚二甲基硅氧烷(PDMS)　切入点：断裂韧性　出处：《浙江大学》2017年硕士论文　论文类型：学位论文

【摘要】：聚二甲基硅氧烷(PDMS)是一种广泛用于柔性电子领域的高分子聚合物,以其独特的光学透明性、良好的柔性、化学惰性和形状复制能力在微纳米器件转印、柔性电路基底制备等方面发挥了重要作用。PDMS虽然具有良好的弹性,但是其断裂韧性较差,在存在缺陷(如裂纹)时,极易发生破坏,这极大地限制了PDMS的工程应用。本文针对PDMS的裂纹敏感这一缺陷,选用了两种组成成分分别为锦纶和氨纶包芯丝的高韧性平针纬编纤维织物作为增韧材料,与PDMS进行复合来提升断裂韧性,进而拓宽它在柔性电子器件中的使用范围。本文采用直接涂布法制备纤维织物/PDMS复合材料,分别对两种平针纬编织物以及相应的复合材料沿织物结构的横、纵两个方向进行单向拉伸测试,并分析两种织物及相应的复合材料在横、纵方向的力学性能差异,同时与PDMS试样进行比较。实验结果表明,两种纤维织物/PDMS复合材料在横、纵向拉伸下的弹性.模量、断裂强力、断裂强度以及断裂伸长率比PDMS都有不同程度的提升,其中横向锦纶织物复合材料具有较好的力学稳定性。在裂纹扩展方面,本文分别对PDMS、两种增韧织物以及相应复合材料的单边切口拉伸试样进行了单向拉伸测试。实验结果表明,对于引入预裂纹的增韧织物,锦纶织物的横纵向试样以及氨纶织物的纵向试样能够较好得抵抗裂纹扩展。对于复合材料,发现织物增韧之后的四种复合材料断裂韧性与PDMS相比,均有明显提高,其中横向锦纶复合材料的提升最大,断裂韧性提升率高达700%。此外,本文还对复合材料在有裂纹情况下的加卸载性能进行了分析。这些结果为制备对裂纹不敏感的柔性电子基底材料奠定了实验基础。
[Abstract]:Poly (dimethylsiloxane) (PDMS) is a kind of polymer widely used in the field of flexible electronics. With its unique optical transparency, good flexibility, chemical inertia and shape replication ability, it is widely used in the transfer printing of micro and nano devices. Although PDMS has good elasticity, its fracture toughness is poor, and it is easy to destroy when there are defects (such as cracks). This greatly limits the engineering application of PDMS. In view of the flaw of crack sensitivity in PDMS, two kinds of high toughness plain weft knitted fabrics, which are nylon and spandex cored yarn, are selected as toughening materials. In order to improve the fracture toughness and expand the application range of PDMS in flexible electronic devices, the fiber fabric / PDMS composite was prepared by direct coating method. The uniaxial tensile tests of two kinds of plain weft knitted fabrics and corresponding composites along the transverse and longitudinal directions of fabric structure were carried out, and the differences of mechanical properties of the two fabrics and their corresponding composites in the transverse and longitudinal directions were analyzed. The results show that the elastic modulus, tensile strength, breaking strength, breaking strength and elongation at break of the two kinds of fiber fabrics / PDMS composites under transverse and longitudinal tension are increased by different degrees than those of PDMS. In the aspect of crack propagation, uniaxial tensile tests of PDMS, two kinds of toughened fabrics and unilateral notch tensile specimens of the corresponding composites were carried out. For the toughened fabric with pre-crack, the transverse and longitudinal specimens of nylon fabric and the longitudinal specimen of spandex fabric can better resist the crack propagation. For the composite material, it is found that the fracture toughness of the four composites after toughening is compared with that of PDMS. Among them, the transverse polyamide composite has the largest lift, and the fracture toughness rate is as high as 700. In addition, In this paper, the loading and unloading properties of composites with cracks are also analyzed. These results provide an experimental basis for the preparation of crack insensitive flexible electronic substrates.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332

【参考文献】